Packing stabber



May 10, 193s.

36 Lul J. M. cLEvENGl-:R 2,117,149

PACKING STABBER Filed March 1' 195,7

HIS ATTORNEYS Patented May 10, 1938 UNITED STATES PATENT OFFICE Claims.

My invention relates to printers tools, and has among its objects and advantages the provision of an improved packing stabber.

In the printing art it is customary for the press- 5 man to print an impression on a sheet to determine Whether all printing parts of the bed plate have proper pressure relation with the cylinder. It is common practice to provide the cylinder with packing over which the sheet upon which the test impression is to be made isstretched. The

printing is done by revolving the cylinder in synchronized relation with the reciprocating bed plate.

After the test sheet is printed, the sheet is examined to determine Whether the impressions thereon are uniformly perfect. In the event of defective impressions, a packing stabber is employed for making marks in the test sheet, which p marks are imbedded in the packing on the cylinder. After the sheet is marked, it is removed from the cylinder and the light spots backed up by attaching pieces of paper Where needed. If the impressions are printed heavily, parts of the sheet Y may be cut out.

In the trade this test sheet is usually called a spot sheet. After the spot sheet has been corrected, it is replaced on the cylinder underneath an unprinted sheet which Was originally positioned underneath the spot sheet and carries stabber marks corresponding to the marks in the spot sheet. It is absolutely necessary that the spot sheet occupy its original position on the surface of the cylinder, which position may be easily determined by aid of the stabber marks which are of sufficient depth to penetrate a considerable depth into the packing on the cylinder. In using a packing stabber it is necessary to limit the depth of the stabber marks to prevent complete penetration of the packing and consequent *Y damage to the cylinder.

An object of my invention is to provide a packing stabber Which may be adjusted for stabbing the packing to any required depth Without the danger of stabbing through the packing and into the cylinder.

A further object is to provide a packing stabber in which the stabbing forces may be so controlled as to provide uniform stabbing depth and in which the depth does not depend upon the judgment of the user of the tool, but is determined by mechanical means which operate with such a degree of uniformity as to absolutely prevent damage to the cylinder.

Another object of the invention is to provide a packing stabber which may be operated with one hand, thereby rendering the tool applicable to locations to be stabbed which are not readily accessible and in Which the stabber is so constructed as to eliminate the necessity for an additional tool, such as a hammer, for striking pur- 5 poses.

A further object is to provide a packing stabber in which the piercing element is in the nature of a tubular cutter including means which is automatic in operation for ejecting paper disks 10 which might lodge Within the tool.V

In the accompanying drawing:

Fig. 1 is an elevational view of a packing stabber according to the invention Fig. 2 is a sectional view along the line 2-2 of 15 Fig. 1;

Fig. 3 is an enlarged sectional detail view showing the manner in which the cylinder packing is stabbed;

n Fig. 4 is a view taken from the position indi- 20 cated by line 4-4 of Fig. l; and

Fig. 5 is a sectional view along the line 5-5 of Fig. 3.

In the embodiment selected to illustrate my invention, I make use of a tubular body I0 within which I slidably mount an impact head I2 which is urged against a stop member I4 by a spring I6. One end of the spring is arranged in abutting relation with the plug I8 having threaded relation at 2U with the body I0. The opposite end of the 30 spring has i pressure relation With the impact head I2 and encircles an extension 22 carried by the head.

In Figs. 2 and 3, I illustrate the stop I4 as having threaded relation at 24 with the body I and 35 as being provided with a central opening 28 for accommodating the tubular marking element 28 formed integrally with the impact head I2. I sharpen the cutter 28 at 30 to facilitate penetration of the packing 32 upon the printing cyl- 40 inder 34. I slot the body Ill at 36 to accommodate a pin 38 connected with the impact head I2 for retracting the same against the tension of the spring I6. Slot 36 communicates with an offset slot 40 which receives the pin 38 in the 45 retracted position of the impact head I2 for retaining the head in its retracted position.

In Fig. 3, I illustrate the extension 22 as having threaded relation at 42 with the impact head I2. A threaded opening 44 is provided in the ex- 50 tension 22 for the reception of the threaded end 46 of the pin 38. The pin extends through an opening 48 in the impact head I2. Within the bore 50 in the impact head I2 I position a head 52 carried by a plunger 54 slidably mounted 55 within the tubular cutter 28. A spring 56 is interposed between the extension 22 and the head 52 for urging the plunger 54 to the position of Fig.. 2, at which time it projects beyond the cutting edge 38 for ejecting paper disks which might lodge within the tubular cutter.

In operation, the impact head I2 is retracted and latched in its retracted position by rotating the head slightly within the body I0 for positioning the pin 38 within the offset slot 40. The end of the stabber is then positioned against the spot sheet 58 which may lie over one or two additional sheets B which are stretched over the packing 32 carried by the cylinder 34. With the stabber properly positioned, the pin 38 is moved for bringing it out of holding relation with the slot 43, at which time the spring I6 propels the impact head I2 in the direction of the stop I4. The penetrating depth of the cutter 28 is determined by the position of the stop I4. Normally the cutter 28 passes through the spot sheet 58, the sheet 60 which may lay underneath the spot sheet and partly through the packing 32.

I am aware that marking devices have been employed wherein a hammer is employed for drivv ing the marking into the cylinder packing. With such tools it is possible to penetrate a su'cient depth, but in many cases the blows are struck with excessive force, which drives the piercing element through the packing and into the cylinder, thereby damaging the latter. Even though the piercing element may be associated with a stop, excessive forces sink the tool bodily into the packing, thereby causing damage to the cylinder. It is, therefore, essential that the stabber be so designed as to prevent excessive penetration.

My stabber embodies a piercing element in which the piercing forces are determined by the spring I6 so that the penetrating forces are of a uniform nature, thereby preventing the tool from damaging the cylinder. The depth of penetration is easily adjusted through the medium of the stop I4 while the spring I6 drives the impact head I2 in its piercing direction with the same forces at all times.

Another important feature resides in the provision of a stabber in which the tool may be supported in one hand and the impact head released by a finger of the hand supporting the tool. In this way I attain accessibility to situations in which it is diflicult and many times impossible to support the tool with one hand and drive the piercing element home with an addition tool, such as a hammer. Should paper disks lodge in the cutter 28, the disks are rejected when the tool is lifted from the cylinder. The tension of the spring 56 is suiicient to eject the paper disks but is such as to permit the plunger 54 to move inwardly of the cutter 28 when the end of the stabber is placed adjacent the work to be marked.

Without further elaboration, the foregoing will so fully explain my invention that others may, by applying current knowledge, readily adapt the same for use under various conditions of service.

I claim:

l. A packing stabber comprising a guide, a tubular cutter of the impact type, resilient means cooperable on the guide and said cutter for propelling the same, and means operating within the tubular cutter for ejecting material lodging therein.

2. A packing stabber comprising a guide, a tubular cutter of the impact type, resilient means cooperable on the guide and said cutter for propelling the same, and means operating within the tubular cutter for ejecting material lodging therein, said last named means comprising a spring pressed plunger.

3. A marking tool comprising a tubular body having a slot, a marking element of the impact type loosely positioned Within the tubular body, a stop positioned inside the tubular body for limiting the eiectve impact of the marker, spring means positioned within the tubular body and cooperating with the marker for propelling the same, manually actuated means connected with the marker and extendng through said slot for retracting the marker against the tension of said spring.

4. A marking tool comprising a tubular body having a slot, a marking element of the impact type loosely positioned within the tubular body, a stop positioned inside the tubular body for limiting the effective impact of the marker, spring means positioned within the tubular body and cooperating with the marker for propelling the same, manually actuated means connected With the marker and extending through said slot for retracting the marker against the tension of said spring, said slot being provided with an oiset slot for receiving said manually actuated means for holding the marker in its retracted position.

5. A marking tool comprising a tubular body having a slot,-a marking element of the impact type loosely positioned wthin the ltubular body, a stop positioned inside the tubular body for limiting the effective impact of the marker, spring means positioned within the tubular body and cooperating with the marker for propelling the same, manually actuated means connected with the marker and extending through said slot for retracting the marker against the tension of said spring, said slot being provided with an offset slot for receiving said manually actuated means for holding the marker in its retracted position, said marker comprising a tubular element having a cutting edge, and resilient means operating within the tubular element for rejecting material lodging therein.

JERRY M. CLEV'ENGER. 

